Physical Chemistry The Joule Thompson Experiment

In this lesson our instructor talks about the Joule Thompson experiment. First he discusses some general equations. Then he talks about the Joule Thompson Experiment and the inversion temperature for hydrogen and helium.

If the mixture is of a fixed composition that does not change ( for example, 30% Methane Gas and 70% Carbon Dioxide gas), then the equations are the same: you do not have to consider anything else.

But if the composition is changing during a change of state, then a new set of equations is necessary: these equations are the same, except they have an extra term which involves something called "chemical potential", which we symbolize with a lower case Greek mu.

I have not done any lessons on mixtures, because, in general, they are not discussed in most P-Chem courses. However, I may consider adding several lessons on this topic in the future.

I hope I have answered your question satisfactorily. If I have misunderstood anything, please let me know.

Best wishes.

Raffi.

1 answer

Last reply by: Professor HovasapianWed Nov 4, 2015 8:37 PM

Post by Jupil Younon November 1, 2015

when you talking about U and H as functions of two variables, you mean U and H about a pure substance? In case of mixture, what extra factors should I consider?

The Joule Thompson Experiment

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Related Books

"As the first modern physical chemistry textbook to cover quantum mechanics before thermodynamics and kinetics, this book provides a contemporary approach to the study of physical chemistry. By beginning with quantum chemistry, students will learn the fundamental principles upon which all modern physical chemistry is built. The text includes a special set of ""MathChapters"" to review and summarize the mathematical tools required to master the material Thermodynamics is simultaneously taught from a bulk and microscopic viewpoint that enables the student to understand how bulk properties of materials are related to the properties of individual constituent molecules. This new text includes a variety of modern research topics in physical chemistry as well as hundreds of worked problems and examples."